1.
1) = 0,2*7 = 1,4
2) = √49*2*2 = √49*4 = 7*2 = 14
3) = √(147/3) = √49 = 7
4) = (-5)² = 25
2.
1) 7=√49
√49<√50<br>7<√50<br>2) 5√0,4 = √25*0,4=√10
2√2,6 = √4*2,6 = √10,4
√10<√10,4<br>5√0,4<2√2,6<br>3.
при 15-5х≥0
5(3-х)≥0
3-х≥0
х≤3
х∈[3; ∞)
4.
1) = (√3)² - 2*7*√3+7² = 3-14√3+49 = 52-14√3
2) = (√7)²- (√2)² = 7-2 = 5
3) = 3√24:√3+√3:√3-3√2 = 3√8+1-3√2 = 6√2-3√2+1 = 3√2+1
5.
= -3xy√7y
6.
=3√7/3 - 2√21 - 4√21/4 = √21 - 2√21 - 2√21 = -3√21